linux-kernel - Re: [PATCH v10 19/19] h8300: devicetree source

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <87a8xhxacw.wl-ysato@users.sourceforge.jp>
Date:	Thu, 07 May 2015 13:47:11 +0900
From:	Yoshinori Sato <ysato@...rs.sourceforge.jp>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v10 19/19] h8300: devicetree source

At Mon, 04 May 2015 17:09:21 +0200,
Arnd Bergmann wrote:
> 
> On Monday 04 May 2015 19:42:02 Yoshinori Sato wrote:
> > +
> > +	h8intc: intc@0 {
> > +		compatible = "renesas,h8s-intc", "renesas,h8300-intc";
> > +		#interrupt-cells = <1>;
> > +		interrupt-controller;
> > +	};
> 
> The node name should be "interrupt-controller@0", not "intc@0", to follow
> the common conventions.

OK.

> > +	tpu: tpu@...fe0 {
> > +		compatible = "renesas,tpu";
> > +		reg = <0xffffe0 16>, <0xfffff0 12>;
> > +		clocks = <&pclk>;
> > +		clock-names = "peripheral_clk";
> > +	};
> > +
> > +	timer8: timer@...fb0 {
> > +		compatible = "renesas,8bit-timer";
> > +		reg = <0xffff80 10>;
> > +		interrupts = <72 75>;
> > +		clocks = <&pclk>;
> > +		clock-names = "peripheral_clk";
> > +		renesas,mode = <CLOCKEVENTDEVICE>;
> > +		renesas,div = <DIV_8>;
> > +	};
> > +
> 
> The renesas,div property seems odd here. How about defining a
> "clock-frequency" property and figuring out the divider from
> the parent clock in the driver?

Hmm...
It more better idea.
I will fix.

> Your new binding makes it mandatory to have a "fclk" clock, which
> seems better suited than "peripheral_clk", so I'd suggest you
> change the code to match the documentation (rather than the other
> way round). Alternatively, you could make this an anonymous
> clock and not specify the name at all.

OK.

> The renesas,mode property seems odd. Why is that needed? It sounds
> like you are encoding how you expect the device to be used by
> Linux, rather than what it can do in hardware. If you have multiple
> variants of the 8bit-timer hardware that have different features,
> better use separate compatible strings for them, or a boolean
> flag that announces the presence or absence of a feature.

This timer have some mode. But driver using only one mode.
I think it isn't necessary.

> If however, this is just a hint for Linux, maybe you can find a way
> for the driver to take a guess itself, e.g. using the first
> device it finds as a clockevent device, and only use a clocksource
> device if there is more than one?

Many clocks are put in order.

> > +	sci0: serial@...f78 {
> > +		compatible = "renesas,sci";
> > +		reg = <0xffff78 8>;
> > +		interrupts = <88 89 90 91>;
> > +		clocks = <&pclk>;
> > +		clock-names = "peripheral_clk";
> > +	};
> > +	sci1: serial@...f80 {
> > +		compatible = "renesas,sci";
> > +		reg = <0xffff80 8>;
> > +		interrupts = <92 93 94 95>;
> > +		clocks = <&pclk>;
> > +		clock-names = "peripheral_clk";
> > +	};
> > +	sci2: serial@...f88 {
> > +		compatible = "renesas,sci";
> > +		reg = <0xffff88 8>;
> > +		interrupts = <96 97 98 99>;
> > +		clocks = <&pclk>;
> > +		clock-names = "peripheral_clk";
> > +	};
> > +};
> 
> The binding for sci requires the clock to be named "sci_ick",  so please
> use that instead of "peripheral_clk". The driver can handle both.
>

OK.

> 	Arnd

Thanks.

-- 
Yoshinori Sato
<ysato@...rs.sourceforge.jp>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/